My Xiaomi mobile phone won't vibrate ...

It only takes three clean-ups to solve it. Make a backup before Sanqing. You can install a 9 1 mobile assistant in your mobile phone to back up the address book and text messages in your computer. It is recommended not to back up system data and game software data, and reinstall them after three cleanups.

Method:

When the mobile phone is turned off, press the volume increase button first, and then press the power button. After the mobile phone is restored, it will be cleared (clearing cache, clearing user data and clearing all data), and the mobile phone will be restarted.